Get FileSelect dialog work on athena

athena/test/sample_activity.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "athena/test/sample_activity.h"
 
 #include "ui/views/background.h"
 #include "ui/views/view.h"
 #include "ui/views/widget/widget.h"
 
@@ skipping 27 matching lines @@
 
 bool SampleActivity::IsVisible() {
   return contents_view_ && contents_view_->IsDrawn();
 }
 
 Activity::ActivityMediaState SampleActivity::GetMediaState() {
   return Activity::ACTIVITY_MEDIA_STATE_NONE;
 }
 
 aura::Window* SampleActivity::GetWindow() {
-   return
-       !contents_view_ ? NULL : contents_view_->GetWidget()->GetNativeWindow();
+  return !contents_view_ ? NULL
+                         : contents_view_->GetWidget()->GetNativeWindow();
+}
+
+content::WebContents* SampleActivity::GetWebContents() {
+  return NULL;
 }
 
 void SampleActivity::Init() {
 }
 
 SkColor SampleActivity::GetRepresentativeColor() const {
   return color_;
 }
 
 base::string16 SampleActivity::GetTitle() const {
@@ skipping 26 matching lines @@
 }
 
 void SampleActivity::PrepareContentsForOverview() {
 }
 
 void SampleActivity::ResetContentsView() {
 }
 
 }  // namespace test
 }  // namespace athena